Recording and reproduction apparatus for mechanical sound records



Dec. 31, 1935. K Ess ET AL 2,025,900

RECORDING AND REPRODUCTION APPARATUS FOR MECHANICAL SOUND RECORDS FiledAug. 18, 1934 2 Sheets-Sheet l Dec. 1

K. RIESS ET AL 0 2,025,900

RECORDING AND REPRODUCTION APPARATUS FOR MECHANICAL SOUNDRECORDS I FiledAug. 18, 1934 2 SheetS-Sheet-Z lip. 6'

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Patented Dec. 31, 1935 UNITED STATES RECORDING AND REPRODUCTION APPA-RATUS FOR MECHANICAL SOUND REC- OBDS Kurt Riess, Wolfen KreisBitter-field, and one Liebchen and Walter Schultze, Dessa halt, GermanyuinAnassignors to LG. Farbenindustrie Aktiengesellschaft,Frankfort-on-the- Germany Main,-

Application August 18, 1934, Serial No. 740,488 In Germany August 19,1933 Claims. Our present invention relates to a recording nd reproducingapparatus for mechanical sound record on band-shaped record bases.

One of its objects is an improved apparatus of this kind which iseflicient and simple in construction. Further objects will be seen fromthe detailed specification following hereafter. Reference is made to theaccompanying drawings in which Figs. I to 3 represent an embodiment ofthe invention in longitudinal section,

Figs. 4 and .5 show individual parts of the device shown in Figs. 1 to 3in a section transversely to the sectional direction of Figs. 1 to 3,

Fig. 6 shows a front view of the pick-up device,

Fig. 7 shows a plan view of the pick-up device and Fig. 8 shows alongitudinal section of the pickup device.

According to the invention the pick-up or recording head of suchapparatus is fitted to the hinged lid of the housing of the apparatus. Adevice provided in the apparatus prevents the needle or stylus fromcoming into contact with 5 the sound record base when the lid of thehousing is closed. Furthermore, there may be fitted a' device whichrenders it impossible for the stylus to be let down on to the supportingguide for the sound record band when a record band has not beeninserted.

The invention will now be described with reference to the accompanyingdrawings.

The pick-up or recording head I is fixed on the lid 2 of the housing ofthe sound recording and reproducing apparatus, in such a manner that itemerges outside the lid as soon as the latter is opened. When the lid 2is opened, a lever 3 which is articulated at one end to the lid and atthe other connected with a pawl 4, by the intervention of an escapementwheel 6 turns the cam disc 5 so that the pawl 4 comes up against apin 1. The cam disc 5 is disposed in such a manner that, when the lid isclosed and the pick-up connected therewith is lowered, the latter bearsagainst a projection 8 on the cam disc 5, so as'to prevent the needle orstylus coming into contact with the sound record bas'e placed over thefilm guiding roller 9. By turning a.lever II which is in frictionalconnection with cam disc 5 in the direction indicated by the arrow inFig. '2, the cam disc 5 is turned so that the-recess l2 takes the placeof the projection 8. The pick-1:: to such an extent as to permit thestylus to come into contact with the sound record base.

a film is inserted, a finger it engages, as indiis, by so doing, loweredA bar I 3 articulated to the lever l lprevents the lever II from beingmoved when the lid is open. In order to prevent the stylus from cominginto contact with the guide'roller 9 for the film when cated'by dottedlines (Fig. 5) in a. notch l5 on the cam disc 5 and prevents rotation ofthe latter until the finger is pressed, overcoming the force of thespring it, out of the notch l5 by the sound record base I0. 10

The pick-up is mounted in the lid of. the housing in such a manner thatit can be displaced transversely to the direction in which the soundrecord band runs. The pick-up is preferably pivotally mounted andflexibly connected with its 15 adjusting device. Its 'distance from thesound record base can .be adjusted without its being necessary for theapparatus to be opened to dose.

In order that it may be possible to carry out all necessary adjustmentsof the pick-up or the 20 stylus in relation to the record band or to theguide track on the record band when the lid of the housing is closed,the said lid is preferably made of transparent material, for example ofglass or of so-called splinter-proof glass over its 2 entire area. ormay be only opposite certain particularly important places in the filmguide.

Figs. 6, 7 and 8 show a controllable pick up device which consists of apermanent horseshoe magnet having between its pole shoes 22 the 0armature 23 which bears the coil 24 and the recording or reproducingstylus 25. Sheet metal pieces 26 and 21 are secured to the magnet. Thesepieces contain the bearings for pins 28 and 29, so that the magnet canbe swung horizontally. 3 The pins 28 and 29 are secured to theintermediate piece 30 which is rotatably mounted on the axle 3|. Theaxle 3! is fixedly mounted on the walls 32 of the casing; the magnet maytherefore be swung in vertical direction. Control of 40 the magnet inhorizontal direction, that is to say rotation about pins 38 and 29 iseffected by turning wheel 33. This wheel is mounted on the axle 34 whichis rotatably mounted in the walls 32 of the casing; onthe screw threadof 45 this-axle there may be displaced the piece 35 which is not fixedlymounted on the horseshoe magnet but resiliently by the springs 36. The

axle 34 may be arranged above or below thehorseshoe magnet, it may,however, as shown, 50 also traverse the magnet. In this case, the limbsmust contain borings 31 which have a greater diameter than the axle. Thestylus is adjusted on the sound record base, that is to say in verticaldirection by means of wheel 38 55 in the same manner as in horizonaldirection. According to rotation of the pick-up device in right-hand orleft-hand direction, spring 39 or guiding a band shaped carrier for asound groove on a normal path, a support over which said car-.

rier is guided for scanning the latter and a sound box including astylus mounted in said lid so as to be capable of engaging said carrierwhen closing saidlid.

2. An apparatus for mechanically recording or reproducing sounds whichcomprises in combination a casing open-sided at the top, a lid hinged tosaid casing for covering the opened side of said casing, means arrangedinsaid casing for guiding a band shaped carrier for a sound groove on anormal path, a support over which said carrier is guided for scanningthe latter, a sound box including a stylus mounted in said lid so as tobe capable of engaging said carrier, means for preventing said stylus toengage said carrier on closing said lid and means for bringing saidstylus into contact with said carrier after closure of said lid.

3. An apparatus for mechanically recording or reproducing sounds whichcomprises in combination a casing open-sided at the top, a lid hinged tosaid casing tor covering the opened side of said casing, arranged insaid casing for {guiding a band shaped carrier for a sound groove on, anormal path, a support over which said carrier is guided for scanningthe latter, a sound box including a stylus mountedin said lid so as tobecapable of engaging said carrier, means for preventing said stylus toengage said carrier on closing said lid, means for bringing said stylusinto contact with said carrier after closure of said lid, meanscontrolled by said carrier for preventing said stylus to contact withsaid support when no carrier is inserted in said guide means and meansfor laterally moving said stylus when the lid is closed.

4. An apparatus tor-mechanically recording or reproducing sounds whichcomprises in combination-a casing open-sided at the top, a lid .hingedto said casing for covering the opened side of said casing, meansarranged in said casing for guiding a band shaped carrier for a soundgroove on a normal path, a support over which said carrier is guided forscanning the latter, a sound box including a stylus mounted in said lidso as to be capable of engaging said carrier, a cam disk provided withprojections mounted in said casing so that on closing said lid saidsound box comes to lie on said cam disk, an escapement wheel mounted infixed relation with said cam disk, a lever articulated at one end to thelid, a pawl hinged to the free end of said lever and engaging saidescapement wheel, so that on closing said lid one of said projectionsreceives said sound box, means for bringing said stylus into contactwith said carrier after closure of said lid, means controlled by saidcarrier for prevent,

ing said stylus to contact with said support when no carrier is insertedin said guide means and means for laterally moving said stylus when thelid is closed.

5. An apparatus for mechanically recording or reproducing sounds whichcomprises in combination a casing open-sided at the top, a lid hinged tosaid casing for covering the opened side of said casing, means arrangedin said casing for guiding a band shaped carrier for a sound groove on anormal path, a support over which said carrier is guided for scamiingthe latter, a sound box including a stylus mounted in said lid so as tobe capable of engaging said carrier, a cam disk provided withprojections mounted in said casing so that on closing said lid saidsound box comes to lie on said cam disk, an escapement ,wheel mounted infixed relation with said cam disk, a lever articulated at one end to thelid, a pawlhinged to the free end' of said lever and engaging saidescapement wheel, so that on closing said lid one of said projectionsreceives said sound box, a second lever in frictional connection withsaid cam disk, a second pawl rotatably connected with said second lever,a spring urging said pawl against said engagement wheel so that onturning said lever it turns said engagement wheel and thereby said camdisk whereby said stylus engages said carrier, a second spring pullingsaid-second lever in the direction of said first lever, means controlledby said carrier for preventing said stylus to contact with said supportwhen no-ca-rrier is inserted in said guide means and means for laterallymoving said stylus when the lid is closed.

' KURT RIESS. OTTO LIEBCHEN. WALTER SCHULTZE.

